<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
</head>

<body>
    <div id="app">
        <input type="text" v-on:keyup="getKeycode" />
        <input type="text" v-on:keyup.bbb="getKeycode" />
    </div>
    <script src="./vue.js"></script>
    <script>
        Vue.config.keyCodes.bbb = 66;
        var vm = new Vue({
            el: '#app',
            data: {
                keycode: '',
            },
            methods: {
                getKeycode: function(event) {
                    console.log(event.keyCode);
                },
            },
        });
    </script>
</body>

</html>